One of the things I’ve discovered (and creeps into many of my posts) is that the vows between Catholics and Protestants are simply not the same vows. Catholics are brought up one way; Protestants are brought up another. They may say the same words at the wedding, but they mean different things to each party. The blatantly obvious one deals with divorce. As I found out, the vows to my ex meant “til death do us part, or until I decide to get a divorce.”
Can these marriages work? Of course, but people tend to get along better when they agree on fundamental issues, such as religion.
Here is the thing. Catholics, for whatever reason, are a religious group for whom interfaith marriage is not likely to increase their chances of divorce. That does not mean that Catholics who stay in their interfaith marriages are happier.
This article was written by a Jew married to a former Jehovah’s Witness, raising their children Jewish. She is not against interfaith marriages, but she was forced to conclude by her polling that “… interfaith marriages often come with a heavy price. They are more likely than same-faith unions to be unhappy and, in some circumstances, to end in divorce. They also tend to diminish the strength of religious communities, as the devout are pulled away from bonds of tradition and orthodoxy by their nonmember spouses.”
The poll also found this, however: "Certain faith pairings seem more likely to result in divorce. While roughly a third of all evangelicals’ marriages end in divorce, that figure climbs to nearly half for marriages between evangelicals and non-evangelicals. It is especially high (61 percent) for evangelicals married to someone with no religion. (My definition of interfaith marriage did not include couples from different evangelical, or different mainline, denominations.)
Evangelicals and black Protestants in interfaith marriages reported the least satisfaction. Mormons, remarkably, reported high levels of satisfaction — in interviews, some expressed confidence that their spouses would eventually convert. Catholics in interfaith marriages were no more likely to divorce than those married to other Catholics."
Read the article for yourself, but what I took away from it is that an interfaith marriage is not more likely to lead a Catholic to divorce, but it is likely to cause unhappiness and make the practice of the faith more difficult, including the responsibility to raise the children Catholic. This is in keeping with my experience of the marriages I have known among friends and relatives over my lifetime:
nytimes.com/2013/04/06/opinion/interfaith-marriages-a-mixed-blessing.html?_r=0
The author of the article concludes: “So while I recognize that the diminishment of religious institutions and a rise in marital instability could be among the long-term effects of interfaith marriages, I cannot wish for the tide to ebb. Nor do I think it will.”
I would not conclude that way. I would conclude that pastors ought to warn the faithful in their care that marriage to someone outside the Church, in Paul’s time as in our own, is a difficult road. One really needs to be realistic to “counting the cost.” I would say that the Church’s old standard that the non-Catholic spouse be fully willing that the household be a Catholic household is necessary. Even then, it is not easy. For a spouse of very high merit and particularly for a spouse more likely to support the practice of the faith even more strongly than the actual Catholics one knows, it is worth it, I am not saying it ought to be forbidden, but it will not be easy for either of you. You are asking them to move to a foreign country and, to some extent, to live there as a foreigner. Don’t forget that.
For those who have done it, I would suggest St. Nonna of Nazianzus as a patron. Her husband was a member of the Hypsistarians, a Jewish-pagan sect worshiping Hypsistos, the “Most High” God. He eventually became St. Gregory the Elder of Nazianzus, and their three children were all declared saints, including St. Gregory of Nazianzus, Doctor of the Church.